Table 3.

The type and location of slow wave changes found in patients with young onset Alzheimer’s disease and young onset frontotemporal dementia

	Alzheimer’s disease (n = 89)	Frontotemporal dementia (n = 12)
Type of slow wave changes
Only theta frequencies	25 (28.1%)	6 (50.0%)
Only delta frequencies	11 (12.4%)	0 (0.0%)
Theta and delta frequencies	53 (59.6%)	6 (50.0%)
Location of slow wave changes
Left frontal	72 (80.1%)	9 (75.0%)
Right frontal	62 (69.7%)	8 (66.7%)
Left temporal	70 (78.7%)	10 (83.3%)
Right temporal	57 (64.0%)	10 (83.3%)
Left posterior	10 (11.2%)	1 (8.3%)
Right posterior	9 (10.1%)	1 (8.3%)
Central	18 (20.2%)	1 (8.3%)
Generalised*	42 (47.2%)	0 (0.0%)

* P < 0.001